W Syoyo

Latitude:22.509οN Longitude: 142.533οE Summit:1750 m bsl

West Syoyo hydrothermal vent is located in a caldera in an active Mariana submarine volcano (Baker et al., 2008). W. Syoyo volcano lies in the rear arc of the Northern Seamount Province (Bloomer et al., 1989). No vent has been found but Resing et al. (2009, Table 4) report evidence of low levels of hydrothermal activity based on Light Scatter and Oxidation Reduction Potential (ORP) measurements using CTD rosette package. The plume is seen in elevated Mn and 3He, for discrete water samples collected above the volcano (Resing et al., 2009). Because the vent has not yet been found, there is no information about biological community.